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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: no-threads
// UNSUPPORTED: c++03, c++11, c++14
// <mutex>
// template <class ...Mutex> class scoped_lock;
// scoped_lock(adopt_lock_t, Mutex&...);
#include <mutex>
#include <cassert>
#include "test_macros.h"
struct TestMutex {
bool locked = false;
TestMutex() = default;
void lock() { assert(!locked); locked = true; }
bool try_lock() { if (locked) return false; locked = true; return true; }
void unlock() { assert(locked); locked = false; }
TestMutex(TestMutex const&) = delete;
TestMutex& operator=(TestMutex const&) = delete;
};
int main(int, char**)
{
{
using LG = std::scoped_lock<>;
LG lg(std::adopt_lock);
}
{
TestMutex m1;
using LG = std::scoped_lock<TestMutex>;
m1.lock();
{
LG lg(std::adopt_lock, m1);
assert(m1.locked);
}
assert(!m1.locked);
}
{
TestMutex m1, m2;
using LG = std::scoped_lock<TestMutex, TestMutex>;
m1.lock(); m2.lock();
{
LG lg(std::adopt_lock, m1, m2);
assert(m1.locked && m2.locked);
}
assert(!m1.locked && !m2.locked);
}
{
TestMutex m1, m2, m3;
using LG = std::scoped_lock<TestMutex, TestMutex, TestMutex>;
m1.lock(); m2.lock(); m3.lock();
{
LG lg(std::adopt_lock, m1, m2, m3);
assert(m1.locked && m2.locked && m3.locked);
}
assert(!m1.locked && !m2.locked && !m3.locked);
}
return 0;
}
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